def test_pop(self):
sll = LinkedList()
end = 10
assert sll.size == 0
assert sll.head is None
for i in range(end):
sll.push(i)
assert sll.head is not None
assert sll.size == 1
assert sll.pop() is not None
assert sll.size == 0
assert sll.head is None
for j in range(end):
sll.push(j)
assert sll.size == end
assert sll.head is not None
for k in range(end):
assert sll.pop() is not None
assert sll.size == 0
assert sll.head is None
def test_pop_empty(self):
sll = LinkedList()
with pytest.raises(IndexError):
sll.pop()